4.21-f=7

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Solution for 4.21-f=7 equation: 



4.21-f=7

We move all terms to the left:

4.21-f-(7)=0

We add all the numbers together, and all the variables

-1f-2.79=0

We move all terms containing f to the left, all other terms to the right

-f=2.79

f=2.79/-1

f=-2+0.79/1

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